Facebook's mobile user adoption rate has been equally impressive: it's up 67% in the past year, from 325 million to 540 million. And that doesn't include the 80 million members of Instagram, which Facebook acquired a couple months ago.

Make no mistake: mobile is the future of Facebook's business.

During the earnings call yesterday, CEO Mark Zuckerberg said mobile users are 20% more likely to use Facebook on any given day.

He also said that Facebook is planning for a day when there are 4 billion to 5 billion people who own smartphones out there – more than own Internet-connected computers today.